Author: Balss, R.     [Balß, R.]
Paper Title Page
WEPML031 The New Broadband Accelerating System for the SIS18 Upgrade at GSI 2755
 
  • P. Hülsmann, R. Balß, H. Klingbeil, U. Laier, K.-P. Ningel, C. Thielmann, B. Zipfel
    GSI, Darmstadt, Germany
 
  In this contribution, a new SIS18 rf accelerating system is presented whose cavities are based on magnetic alloy materials. The rf system works at harmonic number h=2 (f=0,43- to 2,8 MHz) and provides the necessary accelerating voltage (up to 50kVp) for SIS18 injector operation for FAIR with high intensity heavy ion beams in a fast operation mode with up to three cycles per second. The paper focusses on the cavity part and its cooling issues as well as the broadband characteristics. Due the lossy magnetic alloy ring core filling, which consists of high permeability Finemet FT3M ring cores (HITACHI), the cavities show a broadband behaviour and thus no cavity tuning during the acceleration ramp is necessary. To keep the bandwidth of the cavities as broad as possible they are cooled by a special mineral oil with low permittivity. Also the beam impedance and the power consumption of the rf system are discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML031  
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WEPML032 The FAIR-SIS100 Bunch Compressor RF Station 2759
 
  • H.G. König, R. Balß, P. Hülsmann, H. Klingbeil, P.J. Spiller
    GSI, Darmstadt, Germany
  • R. Gesche, J.H. Scherer
    Aurion Anlagentechnik GmbH, Seligenstadt, Germany
  • A. Morato, C. Morri, G.T. Taddia
    OCEM, Valsamoggia, Italy
 
  In the frame of the Facility for Antiproton and Ion Research (FAIR) 9 bunch compressor RF stations were ordered for the first stage of realization of the SIS100 synchrotron. For RF gymnastics referred to as bunch rotation, one RF station has to provide a sudden rise in gap voltage of up to 40 kVp within less than 30 µs. The system is designed for a maximum RF burst of 3 ms per second. The RF frequency will be pre-selectable between 310 kHz and 560 kHz at a harmonic number of h=2 with respect to the beam. Compressed bunches with a peak current > 150 A and a width < 50 ns are the goal. For this purpose, a 1.218 m long cavity was designed using iron-based magnetic alloy cores. Variable vacuum capacitors are attached for tuning. The cavity is driven by a cross-coupled push-pull tetrode amplifier. This scheme minimizes the influence of the tetrode's DC current at the working point to the cores. The energy for the pulsed system is stored in a relatively small capacitor bank which will be charged semi-continuously and a voltage-stabilizing device is added. Cavity and power amplifier were realized by AURION Anlagentechnik GmbH ' the power supply unit is designed and built by OCEM Power Electronics.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML032  
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WEPML033 The FAIR-SIS100 Accelerating RF Station 2762
 
  • H.G. König, R. Balß, H. Klingbeil, U. Laier, D.E.M. Lens, P.J. Spiller
    GSI, Darmstadt, Germany
  • G. Blokesch, F. Wieschenberg
    Ampegon PPT GmbH, Dortmund, Germany
  • K. Dunkel, M. Eisengruber, J.H. Hottenbacher
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  • C. Hiltbrunner
    Ampegon AG, Turgi, Switzerland
 
  For the Facility for Antiproton and Ion Research (FAIR) 14 ferrite loaded accelerating RF stations are planned for the first stage of realization of the SIS100 synchrotron. Each RF station has to provide a total peak gap voltage of up to 20 kVp in CW operation - tuneable in the range of 1.1 MHz up to 3.2 MHz to allow ion beam acceleration and beam gymnastics at different harmonic numbers and energy levels in the new facility. Each RF station consists of a tuneable ferrite cavity, a single ended tetrode amplifier and a dedicated power supply and control unit (PSU) ' including two bias current supplies for cavity- and control-grid(G1)-circuit-tuning. The ferrite cavity is based on the SIS18 cavity concept but has to provide a 1.25 times higher gap voltage of 20 kVp over a total length of 3 meters. The realization is done by a consortium consisting of RI Research Instruments GmbH as consortium leader and manufacturer of the cavity, Ampegon PPT GmbH (for the tetrode amplifier) and Ampegon AG (for the power supply unit). In this contribution, the system design is discussed, and commissioning results are presented. All main parameters are achieved with the RF station described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML033  
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WEPML034 Design and Commissioning of the RF System of the Collector Ring at FAIR 2765
 
  • U. Laier, R. Balß, A. Dolinskyy, P. Hülsmann, H. Klingbeil, T. Winnefeld
    GSI, Darmstadt, Germany
  • G. Blokesch, F. Wieschenberg
    Ampegon PPT GmbH, Dortmund, Germany
  • K. Dunkel, M. Eisengruber, J.H. Hottenbacher
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  • C. Morri, M.P. Pretelli, G.T. Taddia
    OCEM, Valsamoggia, Italy
 
  The Collector Ring (CR), a storage ring intended to perform efficient cooling of secondary beams, is under construction at GSI in the scope of the FAIR project. The RF system of the CR has to provide a frequency range from 1.1 to 1.5 MHz and pulsed gap voltages of up to 200 kVp (0.2 to 1 Hz, max. 10-3 duty cycle) and up to 10 kVp in CW operation. Five identical RF stations will be built. Each RF station consists of an inductively loaded cavity, a tetrode based power amplifier, a semiconductor driver amplifier, a switch mode power supply and two digital feedback loops. The main components of the RF station are designed, built and commissioned in close collaboration between GSI and three companies: RI Research Instruments GmbH, Ampegon PPT GmbH and OCEM Energy Technology SRL. In 2016, the first of five RF stations has been integrated at GSI. In 2017 the system was successfully commissioned to demonstrate that all envisaged parameters have been achieved. This contribution will present the requirements imposed the system, the principal design of the overall system as well as of its key components, and the results of the commissioning of the first RF station.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPML034  
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